Oe minim machine



(No Model.) 13 Sheets-Sheet 1. R. STANLEY.

I TUNNEL-ING 0R MINING MACHINE. I

Patented Aug. 29, 1893. I '.1

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3 shets Shcet R. STANLEY. TUNNELING- 0R MINING MACHINE.

Patented Aug. 29

Nrrnn ST TES ATENT. Santos,

TUNNELH NG OR l lilNlNG MAGHINE.

I SPECIFICATION forming part of Letters Patent No. 504,179, dated August29, 1893.

Application filed September 5,

I To aZZ whom it may concern.-

. many;

- comprising two Be it'known that I, REGINALD STANLEY, a subject of theQueen of Great Britain and Ireland, residing at Nuneaton, in the countyof Warwick, England, have invented certain new and useful Improvementsin Tunneling or Mining Machines, (which improvements are shown anddescribed in the following Letters' Iatent, to wit: Patent No. 60,237,dated. February'5, 1892, granted to meinGer- No. 3,595, dated February28, 1890, granted in Great Britain; No. 1,363, dated June 29, 1891,granted in Queensland; No. 5,078, dated July 0, 1891, granted in- NewZealand; No. 3,082, dated June 27, 1891; granted in New South Wales, andNo. 37.971, dated December 16, 1891, granted in Canada) of which thefollowing is a specification, ref-'1 erence being had therein to theaccompanying drawings.

,In the machine which I have devisedthere are two sets of cutters; amain frame or bed parts, one part for each set of cutters; means forconnecting the two parts of said frame; two carriers, one for each ofsaid sets of cutters and adapted to be moved relatively to the bed; atrain of cutter actuating gearing ported upon the bed frame and adaptedto actuate either of said setsof cutters, .or

-that the two sets of a cut of both simultaneously. Preferably thecutters of each set are arranged to rotate around,

are held by arms se- It is also preferable cutters should be arranged onsubstantially the same horizontal lines, transverse of-the machine, sothat they shall be available for producing a relatively wide out. Thereare numerous reasonswhy this sort should be of greater-dimensionshorizontally than vertically. For instance, in the entries in coalmines,.i t is allowable, and necessary in most veins, to have them fromnine to twelve feet wide. In a six cured to their carrier.

- foot vein a single set of cutters of the sort herein described, while.it' may reach from top to bottom of the vein, will not open up 1890.Serial No. 364.060. Ole model.) Patented in England February 28, 1890,No. 5,696; in New South Wales June 27, 1891, No. 3,082; in QueenslandJane 29, 1891', in Canada December 16, 1891, No. 37,971, and indermnny'Pebr-uary 5,1892, No. 60,237.

Ila-1,363 in New Zealand July 6, 1891, No- 5,078;

more than half or two thirds of the entry horizontally, and anotheroperation by'hand or machine is necessary. It is'desirable to take thematerial out from the whole entry at one operation. In thesmaller veinsthe room is so constructed, if a single cutting apparatus is used, thatit is impossible to readilymanipulate the machine and get out thecuttings and remove them to points behind the machine. An apparatus ofthe sort herein provided I can not only work over a larger area of theheading but with it can provide more room for the manipulation of themachine and of the materials removed thereby. Again, whatever be thedepth of theme.-

on each part of said frame; "an-4' othertrain of gearingon each part ofthe'bedchine, or the dimension of the cut made by the machine, it isfrequently found that it is necessary to apply hand tools, of the natureof levers, wedges, drills, or the like, for the purpose of removing thecentral core left by the cutter. By forming two grooves or cuts, eitheroverlapping or independent'ief each other, I'am enabled to apply togreater ad: vantage tools of the sdrt referred tofiand can more easilyattach, break down, andremove,

any coal or other-material which may resisttheoperation of the cutterson thegna'ehine, 501. which may be left as the core.

having two sets of more'or less independent cutters, one or which can bethrown out of Another importantadvantage incident to produced by thefirst cutter can be carried back, and the intervening web can beattached. Therefore there is plenty of room at all. times forgetting atand removing the loos-' ened material. i

It is further preferable that the two sets of cutters should revolve inopposite directions in order that they shall balance each other inrespect to the strains and the rc-actionary thrust which they exert uponthe machine a generally, and upon the braces or devices by which the bedframe is held stationary during the cutting.

Witlrtunnelirg or mining machines of all I sorts, one of ,the mostdiliicult problems has been to construct and arrange the parts so thatthere shouldbe no re-act ionarythrust, either v the parts'A A aresubstantially duplicates,

in a line directly backward, or toward one side, or the other,horizontally, or upward, or downward. Such thrust, and the disadvenatageous strains incident; thereto, have been.

experienced in using all machines provided with a sin'gle cutter or setof cutters.

Bitely moving cutteraas is herein provided for, I, to a large extent,overcome the dlfilfilllties which have been incident to othermachinesfrom this cause. i5 lam aware of the fact that machines have ubeen heretofore devisedcomprising two sets of oppositely moving chaincutters, mounted do move ,on horizontal lines, and also aware 'rh'at twosets of oppositely reciprocating saw Gutters have been used, inhorizontal lines,

and'Ido not claim such mechanisms. ButI believemyself to be first tohave arranged {we vertically revolving cutters so as to move oppositelyand simultaneously and produce ayksrf of such dimensions that the entiremachine can follow ,the cutters."

" The main frame or bed of the machine may be so constructed as to haveits two parts permanently united rigidly together, or so as have'themseparable ordivisible. Again ----th'e"cwo parts of the main frame may beso joined together by connecting andhra'cing devices that thcyshall bemore or less adjustable-in relation to each other, that is ad- 5jnstable forward and back, laterally and verarmy, and yet have theconnecting devices so'arranged that they shall join'the two parts ot heframe with suificient rigidit the one part of Said frame in thiscase-acting to sup- 4 P t n 'st'eady the other. i i i a The engine orother motor may be so con} i structedandarranged asto; be practicablyinseparable'from cit-her of the parts of the bed 't'rame'withouc requiringseparation from the 5 other also; or it'may he madei-n two, more 3orless, independent parts, each capable'of acrtion and each'supported onone of the afore said parts'of the main frame'or bed.

of oneiorm'of cutter head wiihth'e cutters V attachedLRFig. 5 is a planview of a modified form of, machine. Fig. 6 is a side view and Fig. 7 isa front view'of the machine shown in' Fig. 5.,with the cutters removed.Fig. 8

. shows the clutch for the feed mechanism in Fig.5, 6, and 7. Fig. 9shows the feed nut Go and the adjacent parts in Figs. 5,6,fand 7. "--Figs. 1O,,11,,i2, 13 and 14: showthe details in cident to the feed nut inthe machine shown in Figs. 1 and 2.

The mainframe or bed as shown in the drawings is made up of two parts AA. The

, details of this bed may be of anysort dictated Byfur- IQ nishing' themachine'with two sets of oppo- Icured to the frame.

by preference or circumstances, so long as certain requisites arepreserved.

In the mechanism shown in Figs. 1, 2, and

and possess many of thofeatnres of 0011- strnction shown in my earlierpatent, No. 414,893, dated November 12, 1889, and referonce may be madeto said patent for an .understamlihg of the details of these parts ofthe frame. I-lere,'it issulficient to remark that each is composed ofuprights a a joined at the bottom by sills a and at the top by girdersa, together with any additional connecting bars and braces whichmay befound necessary. There are supporting wheels A preferably situated onthe central longitudinal plane of each part A A, of the frames; and atthe top there are binding screws or jacks AFfor engaging with the roofand for fastcningthe machine firmly in 'position.-

The machineoonsidered as a whole is provided with two independentcutting mechanisms. In respect to these also there may be modifications,as the principle of construction and operation embodied in the mechanismherein can also be applied if other forms of apparatus be used.

That selected for illustration comprises a cut-ter-oarrierof the form ofa cross-head or arms l3, secured to a shaft 0. At 13' thereare forwardlyextendingarms or barswhich have applied to them cutters or scrapers. TheshaftO impartsrotary motion to the cutters. and. also advances them intothe material. It is rotated by a train of gearing comprising the wheelD, pinion D,

en a in therewith, wheel D and inion D 2.- qo p The pinion D and wheel'D are on a counter shaft E which is driven from the engine shaft E bysaid pinion D. The shaft 0 and wheel D are connected by groove andfeather or in some equivalent; way, so that the former can advance whilerotating.

G indicates gen-- erally the engine connected to the shaft F, it

and its connection heingof any suitablesort. The mechanism for advancingthe shaft C,

,may also be of any of several well known Asshown it consists of anut'd, held. in place upon the bed firammand having teeth. fformcdeither integral with or separately from the-threaded portionya gearwheel d engaga sorts.

ing with said toothed nut d; and a spurwhecl d on the crank shaft-Fadapted to" be engaged with the last said wheel d. d is' a plate havingapertures th'rou h which pass, the shafts Rand F of the whee sdi'df.flThis plate (i can be caused to move toward and from the nut wheel'atd. I a screw rod d, having. a hand wheel d and engaging with a not at dThe shaft F is It is so moved by secured to and projects from the platea, Se 7 Whennhe nut isito be held stationary so that the cutters willadvance relatively to the frame, a bolt or looking device at d is usedto fasten the nut in place, and at such time the plate (1 is forcedforward by the screw d, and tho plateliar- .ro revolve, and from riesthe wheels d" d away from the wheel d. When, on the other hand, theframe is to be advanced relatively to the cutters, the belt.

Ill

1 rigidly secured to said parts A A or loosely.

If a loose connection is employed it may be of such sort that.variousadjustments can be attained. As shown in Figs. 1, 2 and 3 theseconnecting parts at 1-1 are each formed of two oppositely threaded barsor rods 7L h joined by a central sleeve it having threaded ends toengage with the rods h h. At the ends of bars h h there are ball andsocket joints hh by which they are connected to the parts A A. of thebed. Of these devices I'I there may be as many as occasion requires.Preferably I use two at the front end and two at the rear, and arrangethose of each part so that they cross each other, that is to say so thateach one engages with the top of one of the parts of the bed frame, andwith the bottom of the other. It will be seen that by means of suchdevices the parts of the bed can be braced in any ordinary way desired.It, for any rea- 5 son, it is desirable that either part of the frameshould be slightlyin advance or in rear of the other parts, this can beprovided for when the parts are constructed and arranged as shown, asthere is more or less forward and back movement permitted when theintel-mediate brace-rods are loosened, because of the loose connectionof said rods. Again,

by having the main frame divisible longitudinally into two sections, themachine can 5 be manipulated much more readily as concerns getting it toor from the places of working. These machines are necessarily heavy inorder to have them sufliciently strong to withstand the severe strainexerted upon them; and as the tunnels which they form approximate soclosely the through dimensions of the machine, there is trouble andinconvenience incident to the handling of them.

' When made as described above, they can'be '55 adjusted or moved inparts and yet without dismantling them' materially. Another importantend at whichl aim can be attained under this construction andarrangement;

though itis not'l-imited thereto, namely, the provision for euttingawider or narrower tunnel as may be desired. I provide for this by havingthe two cutter carriers, which are here of the form of twolongitudinally-arranged shafts, so arranged that they and their bearingscan be laterally adjusted toward and from'each other. Y It is the workof but few moments .to change the machine so as to connecting thesecondary shaft of. one enform a narrower heading if the nature of thematerial demands it, orawider one if circum stances permit.

The cutter heads or carriers B of the two cutting mechanisms of themachine'can be I arrangedv so as to alternate with each other in theirrotation, that is so that one will be-in vertical position at the timethe other is in horizontal, or they can work together, that is, be invertical positions and horizontal positions at thesame time. Butineither case the two sets of cutters revolve in opposite directions, bypreference, so that they will throw the cutting and dbris to the outersides of the machine. If they rotated in the-same. direction, more orless of the cuttings and dbris would be delivered on the centrallon;gitudinal line of the machine. By delivering them at -the outer sidesthey can be easily reached for removal to the rear of the machine.

In order to have the two sets of shatring and gearing workin properrelation to eactrg'o" other, I connect them together positively bysuitable devices, such as "a cross shaft andgearing or sprocket chaingearing, or equivalent: In Figs. 1, 2, and 3 a sprocket chain is shown,it connecting two sprocket wheels I 5 1 one n each of the side parts A Aof the frame and preferably secured to proper shafts. As shown','thesechain wheels are connected to the shafts through the medium of the gearwheels d d, to which they are respectively connected by bolts or pins ipassing through apertures in the chain wheels, as illustrated in Figs. 2and 13. Whenever desired, either or :both bolts or pins can be removedsd that the two parts of the machine, will be indepehdent of the other;or one or more clutches of the ordinary sort such as is shown in myprevious patent No. 414,893 can be used. The

chain is shown inFig- 2, by dotted lines as ginejwith the crank shaft ofthe other, and by irieans of full lines it is shown connected withthesecondary shaft of, the other engine. When motionof both cutters in thesame direction is desired the chain will be placediri one or other ofthesepo'sitions, and when opposite movements are wanted, the otherposition can be used. By means of the above described connecting bars.or rods 11 H one part of the bed or main frame serves to I20 strengthen,steadyand keep upright the other.

The sleeve nuts 71. can be turned by wrenches so as to, lengthen orshorten the connecting bars ll to make the connection perfectly rigid.If the binding or jack screws A be loosened, the upper parts of theframe can be moved out or in as may be desired by the connecting rodsll. When twocutt-ingmechanisms and a two-part-frame are thus employed, amachine is provided which is much more rigid than when a singlecuttingapparat us and bed are used, and one which is adapted to stand muchmoreadvantageously the working of the arms and cutters. Byhaving ihelmndn.

- he lzing-gonlii'il or nearly as sulphur and present the dos. ernlor t1nor ore.

*ihed fen-lures: allowing lotinetznent, the Width "ntod are (lei-aired.

.i twonntlingineoin nniisinn so alonetogether not their onto ohm/ll.

eo, and little or no If the two sets of rib is left between them.

cutters nro nrrnng'ed to alternate in their rotation nlmvodeeerihed,they can he brought [still closer iogeiher an opening formed ncroos theentire heading more or less coinplele.

By eonpling togellier by chains or otherwise, theehefting and engines ofthe two ei'cleeofi the machine the engines are oensed to help oneanother, even when both eels of after there will he a tunnel withcontinuous top and bottom adapted to serve as an entry or passage-Way.

In Figs. 5, (Lend 7 there is shown a inodi'- fied machine, though thegeneral principles 'of operation and features of construction arepreserved. In this case, the connecting devices H H which join the sidesections A A, of the bed or main frame are rigidly securedthereto,nndn'e preferably pinned horizon.- telly and may be utilized toenpport other ports of the machine. two sets of editors, tr'ro trains ofou'tter actuating gearing,

cotter carriers, two and two sets of feed devices. But the powershni't'ie arranged 'troneverseiy oihfihe machine and time but a single engineis necessary it haw ing two cylinders, live, and two pistons con nectedto the single power shaft. The engine is here hrong'ht down lower, ander tinged horizontally, and the engine frame I be utilized as part ofthe cross connection be, tween the two side parts A A! of the-bed.

On each side of the machine there is acut ter actuating gearingcomprising the wheel I) on the cutter carrier shell; (1, e pinion D oncounter shaft E, wheel I) also on the counter shaft, and pinion D andwheel D on a short intermediate shafl3-E. D is n double bevel Wheel onthe crank ehaft and is'adnpted to slide thereon, it having a lever J formoving it. When wheel D is in engagement with wheel D the engine andpower shaft will to tote" the euttere. The'feed not all is rotated hythe shaft lilhnving a, beveled Wheel in; and

a pinion L, which engeges with n. wheelllon a short shaft 3 below thecarrier eiieit 0 end "pert of the mill meeting the tion, the nuts Willhe in this ease there are work one having it wheel M which engegos thetoothed lly moons of lever ,l',rtl1e wheel D can he moved out ofengagement with. Wheel if) to nenireil poeitioi'nlori'nio e i- 'einentwith the nioreeeid bevel Wheel l'Viien in engngementwitli the letter,the not cl is caused to revolve.

The mom er of using; the feed mechanism will be red in understood. Whenthe outliers ore in he edvenced relatively to the hedthe latter li-lfastened firmly in piece by the jack sci-en's A", or any other suitabledeviooeoclnpn ed to engage with the while ol the tunnel, end it is heldetntionnry until the out in eoinpleted. fit N, N, there one hingedjncire or hrnccn near the control longitudinal line of the machine whichwhen engaging With ftho bottom of the tunnel resist-any reaction or beckthrust and oesiet in holding'ihe machine to its worlr. After rnncedthedesired distance, either after or before the cores have beonlnken outand removed, the bed or main frame can be advnnoed on .to the onliiere,ores nemayhe desired, as follows: The jeolr screws 1A to: gether withany other fastening devices are released, an that-the bed in free.Suitable means for :t'eetening then applied, such for ine once, as thoseshown the cotter cnrriere ore the colt-ere have been nil-1 in myeforesnid Potent No. M4393. Then.

the bevel wheels I) are moved into engngc ment with wheels 1 1.- nnd thenn teere unlocked, whereupon, the engine being; in n10- rotntcd in enohway as to csunelho bed to advance, it moving forward on,the Wheels AF.After it has reached the desired point it is egeinlnstoned in place andthe orto are rendy foi'miothoronlo ,flhe frame in virtnnlly carried uponrfedjnstnhlo pivot-line enpporte the iront'end, rind has, [in the wheelsnnd the portal ment around the ones of the solid pivotnlenn ports; andin reopeoltn these pnrtsth'one ma PJQJHOIQ or lose vol-lotion, solongnsthe essential matters of conelrnction and operation are preeerrcdiI do not olninr herein, any oi lliosnhject my oppiiinnttere not forth inthe claims of cation, flerinl lilo. 398,690, 'liied July whereinnrneehine is shown sin'iilnr to that in Figs. 5 ond'ti herein. i preferto claim herein oil novel mentors common to both ninchines,

cloiining; in eniil othereeeo the illustrated in Fine, 5 end (in 1. Inat tn'nnoling or mining mnehine the combination with e iced frame oftWoinde pendenteete of cutters, an engine on sold bed, and moons forconnecting the said (illiilfilffi in dependently of each other with theheld on gine and disconnecting eten'tinily no set forth.

il. in tunneling or mining machine the novel features incident therein)n'tthe rear end, means for verliicnlndjt stei them therefrom, onlyconihinntion of two indepentlenleete of cn'ti the land or main lirenie,the

pendent cutter ntrriers. nionnted noon eeid two ingle i bed, the twoindependent trains of gearing for advancing the said cutter carriers andmeans substantially as set forth for rotating said cutters,substantially as described.

In a tunneling or mining machine the combination of the two independentsets of cutters, the bed or mainframe, two inde-' pendent cuttercarriers mounted upon the said bed, two independent. trains of gearingfor rotating the sait. two cutter carriers, and means substantially asset forth for moving the cutter carriers relatively to. the bed, asdescribed.

4. In a tunneling. or mining machine the combination of two independentsets of cutters, twoadvaneing and reccding'carriers for said sets ofcutters, respectively, a bed frame comprising two parts each of wh? '11supports one of the aforesaid carriers, a train of cutteractuating gearon each of said parts of the bed, a train of cutter advancing gear oneach part of said bed, and an engine on each part of said bed adaptedto'beindcpendent of that on the other part, substantially as set forth.

5. In a tunneling or mining machine the combination of the twoindependent sets of cutters, the two independent cutter carriers, thetwo independent sets of cutter-actuating gears, and the bed or mainframe formed in two parts, each part having secured to itone of the saidcutter carriers and trainsof gearing, and adjustable connecting barsorbraces for joining the two parts of the said bed or main frame,substantially as set forth.

6. In atunnclingmachine,thc combination of amain frame or bed, an engineor driving .mechanism, cutter-rotating gearing, two sets ofindependently rotating tnnnelforming cutters, and cutter carriers whichare adj ustable laterally toward and from each other whereby the widthof the out can'bc modified,

' substantially as set forth.

7. In a tunneling or mining machine the combination of the two adjacentsets of independent cutters which form two horizontal cylindrical kcrfs,the cutter carriers, and the main frame having the two parts or sectionsrespectively supportingthe said cutter car-- riers, said. sections ofthe bed, and said outter carriers being adapted to pass into the saidkerfs, means substantially as described for connecting together the twoparts of the bed or frame which support the cutter carriers, t-woindepcinlcntly acting cutter actuating mechanisms on said framesections, ro spectively, and two independently acting outter-advancingmechanisms on said frame-sections, respectively, substantially as setforth.

8. In a tunneling or mining machine, the combination of the two sets ofcutters, the separate cutter carriers, and the bed frame which supportsthe said carriers and cutters formed of two parts adapted to be adjustably connected together, snbstantiallyas set forth, whereby one canbe moved longitudinally forward or back. r-' 'l.-tti\'ely to the other,as described.

'which supports gine's [or driving the said 9. In a tunneling or miningmachine, the combination of the two sets of cutters, the separate cuttercarriers, and the bed frame and said cutter carriers formed in two partsadapted to be adjustably connected together, at their upper-parts asdescribed.

10. In a tunneling or mining niachine,the combination of the twosets ofcutters, the separate cutter carriers, and the bed frame which supportsthe said cutters and cutter carriers, and formed in two parts adapted tobe adjustably connected together at the bottom substantially as sctforth, whereby the bottom parts thereof can be placed. farther apart orcloser together, as described.

11. In a tunneling or mining machinethe combination -with the twoindependent sets of cutters; the two carriers for said sets. of cutters,the two sets of gearing for rotating said carriers, the two sets ofgearing for advancing said carriers, the independent en-v sets ofcutters, and the frame or bed connected to both the said cutter carriersand having two parts adjustable in relation to each other, substantiallyas set forth. I

12. In a tunneling or mining machine, the combination with the bed ormain frame, of two cutter carriers thereon adapted to ad-' vance andrecede relatively to the bed and mounted in substantially thesamehorizontal plane, two sets of cutters supported by both the saidsets of cutters the said carriers and arranged to form two horizontalcylindrical kerfs, ad j acent to each other, of such dimensions as toadapt them to receive the entire machine, and two independently actingcutter-rotating mechanisms as described.

13. In a tunneling machine, the combina tion of two tunnel-formingcutters, two outter-carriers, two setsof cutter-rotatin g devices,

two engines or motors, a bed or frame which supports all of theaforesaid parts and is divisible centrally and longitudinally intotwomain parts, each part supporting a cutter, a

cutter-rotating'mechanism and an engine, and

two sets of cutter-advancing devices, one oneaclr of said parts of themain frame, whereby the cutters are moved,forward, while the hedisstationary, substantially as set forth.

,ll. In a tunneling or mining machine, the combination of the bed ormain frame two independent sets of cutters adapted to advance relativelyto the main frame, the engine, and the two trains of gearing forrotating the two sets of cutters respectively, and two adjustableconnecting mechanisms for throwing one or both of the said trains ofcutter actuating gearing out of connection with the engine,substantially as set forth.

15. In a tunneling machine, the coinbination of two tunnel-formingcutters, two cutter-carriers,twosetsof cutter-rotating devices, twoengines or motors, a bed or frame which supports all of the aforesaidparts and is low gitudinally separable from top to bottom. in

16. The combination of the cutters, the

threaded feed shaft, the rotatable nut, the two sliding, intermeshing,continuously rotating, gear wheels connected to the power shaft fordriving the nut, and means for sliding them together, into and out ofthe operative position substantially as set forth.

17. The combination of the cutter, the threaded feed shaft, therotatable nut, the intermeshing wheels for rotating said nut, a platefor securing said wheels in permanent relation to each other, and athreaded rod ongaging with said plate for shifting said wheels,substantially set forth.

18. The combination of the cutters, the threaded feed-shaft, therotatable nut, the two sliding, inter-meshing, continnonsly-rotatinggear wheels for driving the nut, means for lockin g the nut againstrotation, the threaded shaft for sliding the said wheels, and thesliding power-transmitting chain-wheel. detachably connected to the saidgear-wheels, substantially as set forth.

19. The combination of two indeperdent cutters, two trains ofcutter-driving gearing, two engines connected respectively to saidtrains of gearing, the chain for transmitting power from one train ofgearing to the other, and means for disconnecting the chain from eitheror both of said trains of gearing, substantially as set forth.

20. lhc combination of the main frame or bed, the two cuttingmechanismsrespectively supported upon, the side parts of the said frame or bed,the two independcnt sets of cutter-actuating devices respectivelyarranged at the sides of the bed, the transvcrsclyan set forth,

21. In a machincfor forming two adjacent 'or intersecting tunnels of aheight greater than that of the machine, the combination of a main frameextending from the center of one, to the ccnterof the otherof saidtunnels, means for holdinsaid frame stationar y, two tunnel formingcutters in front of the main frame and rotating in planes transverse tothe axes of the tun ncls, and .tdval'icing when i at work relatively tothe frame, the engine on said frame, mechanism driven by the engine foradvancing the cutters, and mechanism for rotating them, the said partsbeing arranged substantially as described, whereby the cut tors whileadvancing from the frame are mutually relieved from reactionary and sidethrust, as set forth.

In a machine for forming two adjacent or ,irtcrsecting tunnels, thecombination of the main frame, the clamping d,c\ ices for sccuring theframe stattonarily in place, the two sets of cutters, detachnblyconnected to the engine the two cuttcrcarricrs advancing lon gitudinallyrelatively to the main frame, the gearing for rotating-the saidcuttcrs,the gearing for advancing them, and the power-shaft and theengine both sccu red to the .maiu frame, and situated between the saidcutter carriers, substantially asset forth.

23. In a tunneling or mining machine, the

combination of't'he two independent cutters,

combination of two screw shafts, two sets of cutters carriedthereby,indepeudentbcarings for said screw shafts, a main frame holdingsaid bearings rigidly in relation to each other, and twoindependent setsof gearing supported on said frame for driving said cutters, substantially as set forth. V

25. In a tunneling or mining machine, the combination of the twocutters, the frame be' hind the cutters, the two parallel cuttercarriers on said frame, the engine, and the powershaft situated betweenthe cutter carriers and detachably connected to either or both thecutter carriers, substantially as set forth.

26. Ina tunneling or mining machine, the combination of two independentsets of cutters, a bed frame supportingthe said cutters permanently inthe same relations to each other, an engine on said bed, two independenttrains of gear foradvancing the bed,and means substantially as set forthfor connecting the engine therewith.

27. In a tunneling or mining machine, the combination of the twocutters, the main, frame, the two cutter carriers, the two intcrmediateshafts respectively between said power shaft and thc'cuttcr carriers,and both driven by said powcr-shaft, and two clutches for disconnectingthe cutter carriers from the power shaft ind pendently,substantially assctforth.

28. The comlf ati of two independent;

,cuttcrs, the two cutter carriers, the main frame, the transversepower-shaft and the iongitudinal intermediate shafts both driven by thepower shaft, substantially as set forth.

2!). In a tunneling or mining machine, the combination of the bed or1naiuframc,thc engine mounted thereon, the two cutters or sets ofcutters, and the two clutches, whereby the engine can be connected withboth of the cutters or either one separately, substantially as setforth.

l The combination with the two independent cutting mechanisms and thetwo indcpendent trains of cutter actuating gearing, of the power shaftthe engine, and two clutches respectively interposed bctwct .1 the said"pews-r shaft and the trains of actuating gear- Eng, substantiaily asset forth.

31. .113 a Qunueling 0 r mining machine, the ssmbinmiouof the twoindependent cutter powershaft intermitting1y connected to eithec or 00thof the said trains of winter actuating gearing, substantiaily as setforth.

In testimony whereof 1mm; mysignaturs in mechanisms, the main frame orbed having the presence of two witnesses.

the side parts respectively supporting the cutting? mechanisms and theconnecting Gevzces rigidly secured to the said side parts, me two trainsof gearing for driving the said cutting mschanisms, respetively, and theREGlN'ALD STANLEY,

W'itnssses:

F. RAYMOND BURTON; ERNEST HARKER.

